Emery grinding-machine for flat-surface grinding.



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EMERY GRINDING MACHINE FOR PLAT SURFACE GRINDING.

APPLICATION FILED JAN.17,1913.

1 083 f Patented Jan. 13, 1914.

, I I I a I L- WivEnesses. fzzwzziazi A Horney.

ALFRED SGHOELLER, OF FRANKFORT-ON-TI-IE-MAIN, GERMANY.

EMERY GRINDING-MACHINE FOR FLAT-SURFACE GRINDING.

Specification of Letters Patent.

'Hatented Jan. f! 3, T1 .E il-t.

Application filed January 17,1913. Serial No. 742,601.

T 0 all QUZLOWZ it may concern:

Be it known that I, ALFRED ScnonLLnR, a citizen of the German Empire, residing at Frankf a-t-oli-tlie-Main, HesseNassau, Prussia, Germany, have invented certain new and useful Improvements in Emery Grinding-Machines for Flat-Surface Grinding; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In the metal working industry, especially in fine mechanics, many objects are fabricated of which the upper-surface must be ground to a flat surface. This flat surface cannot be obtained on the ordinary revolving grinding machines, 6. y. the grindingwheel, because the grinding-lines would be curved. To obtain this flat surface the mechanic covers his file with emery-sheet. In conformity with the invention, to obtain mechanically this flat surface grinding, an endless emery-band is led over two rolls mounted on hearings in only one and the same side. between which a grinding table is attached likewise to the same side. in such a manner that the up-running band part slips straight over with a light pressure, while underneath a weight-roll, attached preferably to the grinding-table by means of a reciprocating lever, is provided in order to obtain the necessary tension in the endless emeryband. By constructing the machine with. all the bearings and attachments on one side only, the changing of the band as often as it is desired is permitted by merely removing it with the hand and without undoing a single bolt, nut or other attachment. If the emery-band is worn out, or if during the Work a finer or coarser emery-band is desired, one needs only to lift the under weight-roll, when in consequence of the sin gle bearing of all the parts the emery-band can immediately be taken off and another put on. The quality of the work turned out is increased considerably by the use of a stop adjustably secured to a bridge adapted to be attached to one side of the table, one can thus without difficulty grind at any angle, at the same time facilitating the whole grinding. If for instance the object to be ground be placed against such a bridge, for which purpose the latter can be constructed for angular, oval and circular bodies, the tiring holding of the body to be worked, at

one and the same place on the revolving band is thus unnecessary, and one needs only apply a slight pressure to the object, however for wholesale production the pressure could easily be obtained by means of a weight or av spring attached in any suitable manner to, or by reason of the construction of the bridge, so that the worker needs only place the body to be ground, upon the belt as far as this is not made unnecessary by a feed-mechanism. So as to completely use the emery-band in its whole width and to work every body in spite of the bridge, it is advantageous to constructthe stop-bridge so that it can be adjusted longitudinally as well as cross-wise with relation to the band.

The invention will first be describedin ctuinectio-n with the accompanying drawings, which constitute a part of this specification, and then set forth with more particularity in the claims at the end of the do scription.

l igure 1 shows the apparatus in a perspective view: Fig. 2. in a side View; Fig. 3, in a top view: and Figs. t and 5, the apparatus with a special one-sided fixed square stop.

In the drawings a and Z) are the two supporting rolls for the endless emery-band. Both are mounted on hearings on one side of the frame (2. The roll 6 is driven by the pulley (Z. c is the grindingtable which is also fixed on one side to the frame 0, and to which the weight roll ii is attached by means of the shaft 7" of the reciprocating lever y.

in Figs. 4: and 5. is shown an arm 27 which can be attached to the grindingtable by means of a square stop secured thereto. This arm 11 is in the form of a 'l square and has a longitudinal slot in the base thereof, so as to adapt it to be longitudinally adjusted over the grinding table by such means as a bolt passed through said slot and secured to the square stop, this arm may also be adjusted so as to allow the article to be ground to be placed on the table at an angle.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States 1. In a grinding machine the combination with a frame, of pulleys mounted on said frame, an endless belt running around said pulleys, a grinding table, an arm attached to said frame and extending across said table, and a second arm adjustably attached to said first mentioned arm for the purpose specified.

2. In a grinding machine the combination with a frame, oi pulleys mounted on said frame, an endless belt running around said pulleys, a Q'rinding table, an arm attached to said frame and extending across said table and a longitudinally slotted square adjustably attached to said arm for the purpose specified.

3. In a grinding machine the combination With a frame, of pulleys mounted in bearings on said frame on one side only, an endless belt running" around said pulleys, a grinning table between said pulleys and underneath said belt, a roll attached to said grinding table and adapted to tension endless belt, an arm attached to one side said l l l only and extending across said table, and a second arm adjustably attached to said first mentioned arm for the purpose specified.

4. In a grinding machine the combination with a frame of pulleys mounted on said frame, an endless belt running around said pulleys a. grinding table an arm attached to and extending across said table, and a longitudinally adjustable square attached to said arm for the purpose specified.

In testimony whereof I my signature in the presence of two Witnesses.

ALFRED C CHOELLIQR. lYitnesses FRIEDRICH CARL 'Wnx'rzi-m,

MAX Hnnimtirt Horrx ER.

Uopies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents,

Washington, C. 

